[ejain]

I'm the founder of https://zenobase.com/, another startup in this space.

Completely agree that "graphs without the ability to manipulate data are worse than nothing"--it's hard to gain much insight without being able to drill down and filter the data. Simple questions such as "how strong is the correlation between room temperature and sleep" end up having to be refined e.g. with "ignore weekends" and "correct for different amounts of physical activity".

Being able to "get as much data as possible" sounds good, but garbage in, garbage out applies...

Finally, I don't think it's possible to create a single mobile app that suits everyone, which is why Zenobase has a flexible, generic data model and an API.